Unit: CLI parse + imply relationships (delete-missing implies ignore, not
delete; valid with --delete and delete timing); delete_missing_args config wire
round-trip (ignore_missing_args confirmed client-only); three-section manifest
round-trip and third-section traversal rejection; manifest_delete_missing_args
exact-path semantics; commit-time parking. Existing two-section manifest frames
updated to the three-section format. Integration: default missing entry is a
hard pre-transfer error; --ignore-missing-args transfers the rest and succeeds
(all-missing transfers nothing; empty list still errors); --delete-missing-args
removes exactly the missing mirror and leaves unrelated extras unless --delete is
also present; filter-exclusion protection never blocks the explicit deletion;
--delete-before early timing composes; all parametrized single-threaded vs -m.
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